296,529 The united States Pharmacopeia : twenty - - first revision : official from January 1 , 1985 : the national formulary, - 16 eel. //'by authority of the United Sates Pharmae copeial Convention Inc., meeting at Wa ­ shington, D. C., April 17-19 1980. Prep, by the Committe of Revision and publ. by the Board of trustees. - Rockville : USP Convention, Inc. 1984-. - LVII, /I/. 1685 s ; wykr. ; 50 c m ISSN 0195-7996